reference this.isotope in LayoutMode.layout

fixes bug where Masonry was not filter/sorting on layout after resize, after an insert

examples/insert.html

@@ -34,11 +34,13 @@
 <script src="../bower_components/matches-selector/matches-selector.js"></script>
 <script src="../bower_components/outlayer/item.js"></script>
 <script src="../bower_components/outlayer/outlayer.js"></script>
+<script src="../bower_components/masonry/masonry.js"></script>
 
 <script src="../js/item.js"></script>
 <script src="../js/layout-mode.js"></script>
 <script src="../js/isotope.js"></script>
 <script src="../js/layout-modes/fit-rows.js"></script>
+<script src="../js/layout-modes/masonry.js"></script>
 
 <script>
 
@@ -46,7 +48,7 @@ docReady( function() {
 
   var container = document.querySelector('#container');
   var iso = new Isotope( container, {
-    layoutMode: 'fitRows',
+    layoutMode: 'masonry',
     getSortData: {
       b: 'b parseInt'
     },

js/layout-mode.js

@@ -30,8 +30,7 @@ function layoutModeDefinition( getSize, Outlayer ) {
       '_manageStamp',
       '_getContainerSize',
       '_getElementOffset',
-      'resize',
+      'resize'
-      'layout'
     ];
 
     for ( var i=0, len = facadeMethods.length; i < len; i++ ) {
@@ -100,6 +99,10 @@ function layoutModeDefinition( getSize, Outlayer ) {
 
   // ----- methods that should reference isotope ----- //
 
+  LayoutMode.prototype.layout = function() {
+    this.isotope.layout.apply( this.isotope, arguments );
+  };
+
   LayoutMode.prototype.getSize = function() {
     this.isotope.getSize();
     this.size = this.isotope.size;